CNC Turning
Rotational features, bores, shoulders and end faces, reviewed from your drawing.
View CNC TurningDrawing-based CNC process planning
Custom CNC Machining Services in China
Plan custom CNC machining in China with drawing review, turning and milling routes, materials and inspection requirements. Review actual requirements before agreeing a manufacturing scope.
Drawing and datum reviewDefined process routeInspection planning
CNC machining processes
Select the process that matches your component
Compare the process route, datum relationships and inspection questions. Select a route by feature geometry, tool access, datum relationships and inspection requirements.
CNC Milling
Datum faces, hole patterns, slots and pockets, with fixture access reviewed.
View CNC Milling
CNC Turning-Milling
Coordinate turned and milled features around a defined datum and setup route.
View CNC Turning-Milling
4-Axis Machining
Indexed access to multiple faces and bores on irregular components.
View 4-Axis Machining
How to choose a CNC machining route
Start with the features that locate, mate or carry load in the assembly. Rotational surfaces, off-axis features and deep holes raise different machining and inspection questions. A component may need more than one process; the released drawing, starting form and acceptance requirements define the route to review.
Start with the part function
Identify locating surfaces and mating features before choosing a process. A drawing should explain how the component works in its assembly and which relationships govern acceptance. This hub routes the enquiry to the appropriate process discussion; it does not assign a route to an unseen part.
Compare processes by the features on your drawing
Use these cues to choose the right engineering discussion, not to prescribe a route before the part has been reviewed.
- CNC turning: rotational surfaces and axial features
- Diameters, shoulders, end faces and axial bores are starting points for a CNC turning review. Identify bearing or sealing interfaces, the locating axis and any feature that must relate to it.
- CNC milling: faces, pockets and off-axis features
- Faces, slots, pockets and hole patterns prompt a CNC milling discussion. Show the datum relationships and areas available for clamping; tool access and how the part is supported matter as well as the feature dimensions.
- CNC turning-milling: related turned and milled features
- When a component combines rotational surfaces with flats, slots or cross holes, review how references carry through the operation sequence. Turning-milling process planning coordinates those features; it is not a confirmation that all work fits a single setup or machine.
- 4-axis machining: indexed access to different faces
- Features on different sides may require indexed access and a locating strategy across orientations. Discuss the clamping surfaces, feature relationships and repositioning with the 4-axis machining route; an index position is not evidence of achieved angular accuracy.
- Gun drilling: a deep-hole operation within the route
- For a deep bore, provide diameter, depth, entry face, blind or through-hole condition and relationships to other features. Gun-drilling review considers the separate hole-making operation and its sequence with later work. Not every deep hole requires the same method.
Materials and starting forms
Specify the material designation, condition and traceability requirements. State the proposed starting form, such as bar, plate or an existing blank, where known. A blank drawing and a finished-part drawing answer different questions. These examples are enquiry inputs, not an inventory or approved material-range claim.
Drawing-specific manufacturing planning
Begin with the current revision and distinguish rough from finished surfaces. Discuss the order in which references should be established, stock needed for later work and how the component will be located after repositioning. Confirm each proposed operation and provider boundary for the actual enquiry.
Align the scope before comparing CNC quotations
Two quotations are only comparable when they cover the same drawing revision and responsibilities. These questions help define the work and documentation to be quoted; they do not establish a price or delivery commitment.
- Starting material or blank: confirm whether the enquiry covers a finished component or machining of an existing blank. Material condition, machining allowance and blank geometry can change what must be reviewed; agree supply responsibility rather than assuming it.
- Operation and setup sequence: identify which surfaces establish the references, which features require another orientation, and how the component will be located after repositioning. A combined feature set does not by itself prove that fewer setups are suitable.
- Feature access and acceptance: call out functional fits, internal features, surface finish and datum relationships. Agree their inspection requirements instead of applying a tolerance from an unrelated part.
- Post-machining work: specify heat treatment, coating or other finishing requirements and any surfaces requiring subsequent machining. Confirm the sequence, responsible provider and required records; these operations are not assumed to be included or performed in-house.
- Inspection deliverables: distinguish drawing requirements from the reports, certificates or sample-approval documents requested. Confirm measurement references, inspection stages and reporting scope before treating documentation as part of the quotation.
- Quantity and supply conditions: separate sample quantity, production lots and annual demand. Clarify tooling or fixture responsibility, marking, packaging, destination and requested delivery timing so inclusions and exclusions can be compared.
Supply and order conditions
Order quantity and timing. Tooling-based projects, such as cold extrusion and hot forging, have minimum order quantities confirmed during quotation. Other projects have no minimum order quantity. Production lead time starts after the drawing, applicable standard and inspection plan are confirmed and the deposit has been received.
Supply and outside processing. Jinhua can procure material and deliver finished parts, or machine customer-supplied blanks. We usually coordinate external heat treatment, plating and coating; customers may also arrange these operations themselves.
Packaging and delivery. Batch orders normally use blister trays, cartons and wooden crates, with rust-preventive oil. The trays limit movement and help prevent parts from striking each other. This standard packaging is included in the quotation. Quotation terms include EXW, FCA at the Jinhua plant, FOB, CIF and DAP. DDP may also be quoted when the customer provides the HS code, subject to order-specific agreement. Transport arrangements, freight and customs responsibilities are agreed for each order under the selected terms.
Prepare a drawing-based CNC machining enquiry
- Controlled definition: send the current drawing and revision, an available model, and any specifications referenced by the drawing. State which document governs if the model and drawing differ.
- Functional requirements: identify locating datums, mating features, fits, surface finish and critical relationships. Include application context where it explains why a feature matters.
- Material and blank: state the material designation, condition and proposed starting form. For an existing blank, include its drawing or available geometry information and identify who is expected to supply it.
- Program and acceptance: separate sample quantity, production lot and annual demand. Include requested timing, inspection documents, traceability, finishing, marking, packaging and destination requirements; identify anything still open for review.
Quality and inspection planning
Agree which characteristics need checking and how drawing references should be interpreted. Use the existing Quality page for documented inspection and process-control context. This page contains no achieved inspection result or general acceptance guarantee.
Application context
Explain assembly access, mating environment and locating function where these affect feature planning. These questions help define an enquiry without asserting a customer relationship, industry certification or completed project.
Send the enquiry through the existing RFQ route
Use the Contact and manufacturing RFQ page for project details, and its Email RFQ and Drawings entry to send engineering attachments by email. Identify the drawing revision and unresolved questions in the enquiry. Confirm the proposed route, responsibilities, inspection deliverables and commercial terms before approving the quotation; a suggested drawing change still requires the customer's approval. Engineering procurement preparation guides
Capability scope and limits
Capabilities are reviewed against the actual drawing, material, functional requirements and inspection expectations.
Individual capability values are documented on the Quality page; they are not reproduced here.
Jinhua uses internal CNC turning and milling where the part geometry and reviewed process route are suitable.
Scope is drawing-specific; it is not a promise for every part, material or operation.
Read the existing Quality and inspection page for documented inspection and process-control context.
Real manufacturing cases
Three real manufacturing case stories connect drawing-specific challenges to process planning. These are case-specific examples, not general capability or achieved-tolerance promises.
Automotive steering input shaft
- Manufacturing challenge
- Connect a deep-bore requirement with datum-related internal and end features.
- Process strategy
- Separate deep-hole work, a bounded internal-finishing and left-milling setup, then separate other-end completion with a unified angular reference.
- Why it matters
- Shows how a shaft route separates bore requirements, setup relationships and inspection evidence.
Complex cast aluminum chamber component
- Manufacturing challenge
- Coordinate rotational features and different-side work on a cast blank.
- Process strategy
- CNC turning followed by two independent 4-axis machining setups, with locating references transferred between operations.
- Why it matters
- Demonstrates the relationship between turning and downstream milling without claiming measured conformance.
Irregular aluminum casting
- Manufacturing challenge
- Plan related bore systems and angled communicating features across different orientations.
- Process strategy
- Two independent 4-axis setups use production indexing and datum transfer; the communicating-hole detail remains a documented process requirement.
- Why it matters
- Connects multi-bore geometry to setup planning without turning index positions into measured angular results.
Historical CNC process retrospective: Internal thread and intersecting side hole. This owner-recalled account has explicit evidence limits.
CNC machining buyer FAQ
How do I choose between CNC turning and milling for my drawing?
Start with feature geometry and function. Rotational surfaces point to a turning discussion; faces, pockets and off-axis features point to milling. Identify the datums and mating relationships before selecting a route. A part with both feature families may need a coordinated sequence rather than one process label.
Does a turning-milling route mean the component is made in one setup?
No. The route must account for tool access, clamping and the references used for each operation. A part can need separate orientations or other processes even when turned and milled features are closely related. Confirm the proposed sequence for the actual drawing rather than assuming a single-setup result.
When should indexed 4-axis access be discussed?
Discuss it when features on different sides require controlled access and a clear locating strategy. Include the surfaces available for clamping and the relationships between features. Indexing describes how work is positioned; acceptance of an angular relationship still depends on the drawing and agreed inspection evidence.
What should I specify for a deep-hole or gun-drilling enquiry?
Provide the bore diameter, depth, entry condition, blind or through-hole form, material and related datums. Include intersecting features and requirements for the finished bore. The hole-making sequence, access and inspection method must be reviewed; a deep-hole requirement alone does not establish achieved bore size or straightness.
Which assumptions should match when comparing CNC machining quotations?
Compare the same revision, material and starting form, machining scope, quantities, tooling responsibility, finishing, inspection documents, packaging and delivery conditions. Ask suppliers to identify inclusions, exclusions and information still needed. A unit price without an aligned scope does not describe the same manufacturing enquiry.
What should accompany the enquiry?
Send the current drawing revision, material, quantity, functional datums and inspection expectations. Include starting-form and finishing requirements where known and identify information still open for review.
Does this page establish a tolerance or delivery commitment?
No. Requirements and the proposed route must be reviewed for the actual drawing. Capability scope depends on documented manufacturing and inspection information, and commercial commitments belong in the reviewed quotation.
Where should I send the drawing?
Use the existing contact and RFQ route.